TC7129CLW713

ADCs/DACs - Special Purpose Overview

The TC7129CLW713 is a 4-1/2 digit Analog-to-Digital Converter (ADC) fabricated in low-power CMOS, designed to directly drive multiplexed Liquid Crystal Displays (LCDs). It achieves high-resolution measurements with ±19,999 counts and 10 µV resolution on the 200 mV scale. The device operates on a single supply voltage ranging from 6V to 12V, typically utilizing a 9V source. Key electrical specifications include a maximum clock frequency of 360 kHz, a common mode rejection ratio of 110 dB, and a typical supply current of 0.8 mA at 9V. It incorporates internal phase compensation and successive integration techniques to enhance accuracy beyond standard dual-slope methods.

ADCs/DACs - Special Purpose Feature Summary

• Directly drives 4-1/2 digit multiplexed LCDs including decimal points, continuity indicators, and low battery flags.
• Successive integration technique provides readings accurate to better than 0.005% of full-scale.
• Includes overrange and underrange outputs along with a range select input for auto-ranging applications.
• Features a latch-and-hold input to freeze present readings for snapshot measurements.

ADCs/DACs - Special Purpose Applications

• Full-featured digital multimeters
• High-resolution battery-powered digital measurement devices
• Precision data acquisition systems requiring direct display driving

ADCs/DACs - Special Purpose Procurement Notes

Verify that the ordering suffix '713' corresponds to the specific reel packaging configuration required for surface-mount assembly. Confirm that the component meets RoHS compliance standards as indicated in official documentation. Ensure that the 44-pin PLCC package dimensions align with the target PCB footprint design constraints before finalizing procurement orders.

ADCs/DACs - Special Purpose Selection Notes

Select this component when designing instruments requiring 4-1/2 digit resolution with integrated display drivers. It serves as a direct pin-for-pin replacement for the ICL7129, though external phase compensation components must be removed during such substitutions. Ensure the application supports the 6V to 12V supply range and utilizes a crystal oscillator for optimal line frequency noise rejection.

ADCs/DACs - Special Purpose Part Context

The TC7129 belongs to Microchip Technology's family of 4-1/2 digit analog-to-digital converters featuring on-chip LCD drivers. This series is engineered specifically for high-resolution, battery-powered digital multimeter applications. The CLW variant denotes the 44-pin Plastic Leadless Chip Carrier package, distinguishing it from the PDIP or PQFP options available within the same functional family.

ADCs/DACs - Special Purpose Replacement Considerations

The TC7129 is a direct pin-for-pin replacement for the ICL7129. When substituting, remove any external capacitor and resistor network previously connected between pins 26 and 28, as the TC7129 utilizes internal phase compensation.